Yavapai Sheriff's Office is searching for a man who severely beat another man with a piece of wood at a Verde River campsite.

Authorities on Thursday identified the suspect as 41-year-old Robert David Pearsall of Prescott. A warrant was issued for the man's arrest on charges of aggravated assault with a deadly weapon and setting his bond amount at $50,000.

Pearsall is accused in an attack that took place last Saturday around 9 p.m., in the Drake area of northern Yavapai County, officials said.

Pearsall is suspected of striking a 45-year-old man in the head, face and chest multiple times with a hard piece of wood, the Sheriff's Office said. Pearsall struck the man in an unprovoked manner and without warning, officials said.

The strikes caused severe swelling, lacerations and blood loss to the man's head and face and the blows were hard enough to break and splinter the wood, the Sheriff's Office said.

According to authorities, Pearsall fled the scene after he was confronted by witnesses.

The victim, who lost consciousness, was driven off the campsite initially and later was flown to Flagstaff Medical Center with serious injuries and remains there for treatment, the Sheriff's Office said.

According to authorities, the motive for the attack was unclear, officials said in a press release.

The search for Pearsall was ongoing late Thursday. Authorities believe he knows he is wanted and is trying to avoid contact.

Authorities issued a 2016 picture of the man Thursday, describing him as a white male, mostly bald but with some blond hair and green eyes, and average height and weight.

If anyone believes they see the suspect, they are asked to immediately call 911. Otherwise, anyone with information is asked to contact the Yavapai County Sheriff’s Office at 928-771-3260 or Yavapai Silent Witness at 1-800-932-3232. A direct tip to Silent Witness leading to Pearsall’s arrest is eligible for a cash reward.